2OO ANATOMY AND PHYSIOLOGY FOR NURSES 



commencement of the spinal cord, here called the medulla 

 oblongata. It is an elongated structure, consisting of three 

 divisions or pairs of bodies, called the corpus pyramidale, 



FIG. 102. Base of brain : i, 2, 3, Cerebrum ; 4 and 5, longitudinal fissure ; 

 6, fissure of Sylvius ; 7, anterior perforated spaces; 8, infundibulum ; 9, 

 corpora albicantia; 10, posterior perforated space; n, crura cerebri ; 

 12, pons Varolii ; 13, junction of spinal cord and medulla oblongata; 14, 

 anterior pyramid; 14*, decussation of anterior pyramid; 15, olivary body ; 

 16, restiform body ; 17, cerebellum ; 19, crura cerebelli ; 21, olfactory sulcus ; 

 22, olfactory tract; 23, olfactory bulbs; 24, optic commissure; 25, motor 

 oculi nerve ; 26, patheticus nerve ; 27, trigeminus nerve ; 28, abducens 

 nerve; 29, facial nerve; 30, auditory nerve; 31, glosso-pharyngeal nerve; 

 32, pneumogastric nerve ; 33, spinal accessory nerve ; 34, hypoglossal nerve. 



corpus restiforme, and corpus olivare, united in a single 

 bulb. The medulla oblongata, unlike the brain, is highly 

 sensitive, and if even slightly punctured, convulsions ensue. 



